322597 - using AString as outparam doesn't work when using it from javascript

Status: RESOLVED DUPLICATE of bug 535685

(Core :: XPConnect, defect)

Description

[Michiel van Leeuwen (email: mvl+moz@)]

In an .idl file, i tried to use an AString as outparam. I couldn't get it to work. It threw an NS_ERROR_FAILURE. Both the component implementation and the caller were written in javascript. When using wstring instead, it worked just like it should.

steps to reproduce:
1. write an idl with |void testOutAString(out AUTF8String aStr);|
2. implement the component in javascript:
    function f(aStr){aStr.value="foo"; return}
3. call it: o={}; test.testOutAString(o);

result: error thrown.

Comment 1

[Michiel van Leeuwen (email: mvl+moz@)]

Attachment: testcase: the idl

You need to somehow xpidl this file. I've done that by putting it in mozilla/calendar/base/public, and added it to the makefile

Comment 2

[Michiel van Leeuwen (email: mvl+moz@)]

Attachment: testcase: implementation

this is the implementation. Just put it in the components dir.

Comment 3

[Michiel van Leeuwen (email: mvl+moz@)]

Attachment: testcase: xpshell caller

finally, the caller. Just run from xpcshell. It shouldn't throw an error, but it does.

Comment 4

[Michiel van Leeuwen (email: mvl+moz@)]

Comment on attachment 207751 [details]
testcase: the idl

>  void testOutAString(out AUTF8String aStr);

That should have been AString, not AUTF8String. But it doesn't really matter, because the problem stays.

Comment 5

[Mook (work)]

Fixed by bug 535685 (a one line change) in revision 420131e7219d.